I need to make a switch that takes a momentary signal(I would have to scope the signal to get details) 12 volts, 200milliamps and output a constant 12 volt 2amp signal. I would also like to have the same momentary signal turn off the constant signal.
I have accomplished this with 4 relays that latch and unlatch. That setup was unreliable. I am thinking the way to go is to use a logic module and drivers to accomplish this.
Any thoughts? I have never built a circuit board before, I'm thinking this would be a simple project to start with. Thanks for any help in advance

I guess my first question is how do you get a transistor to stay on with a single pulse of power?

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You can do it with a flipflop and a p-channel Mosfet. In the below picture I used 15V but 12V work too. Every rising edge of the input signal will change the output signal. Note that in this circuit the Source voltage and the power supply voltage of the IC must have the same voltage.